Torsional vibration damper having contact element for delimiting damper interior

Abstract

The invention relates to a torsional vibration damper (10) for a drive train of a vehicle, comprising: a damper input (16) that can be rotated about an axis of rotation (14); a damper output (22) which can be rotated to a limited extent with respect to the damper input (16) against the spring force of at least one spring element (24) and which has a damper output member (30); a damper interior (54) which accommodates the spring element (24) and can be at least partially filled with a lubricant; a first contact element (56) which delimits the damper interior (54) and which has a first contact surface (62) which bears against a second contact surface (64) of a connecting component (60) in order to seal the damper interior (54), at least one of the contact surfaces (62, 64) being at least partially in the shape of a convex ball. The invention also relates to a torsional vibration damper (10), in which the first contact element (56) has an elastomer component (98), on which the first contact surface (62) is implemented.

Description

Field of the Invention

[0001] The present invention relates to a torsional vibration damper according to the preamble of claim 1.

[0002] A torsional vibration damper is described in DE 10 2020 129 530A1, which has a damper input end rotatable about a rotation axis and a damper output end that can be torsionally displaced relative to this damper input end against the spring force of a spring element. The spring element is accommodated in a damper interior space, which is sealed by a abutting element. This abutting element includes a friction ring, which is axially arranged between the damper input end and the damper output end and is tensioned by a Belleville spring.

[0003] It is an object of the present invention to enable the damper output end to be inclined relative to the abutting element in such a way that the influence on the damper characteristics of the torsional vibration damper is as small as possible or does not affect the damper characteristics of the torsional vibration damper. In addition, the torsional vibration damper should also be constructed in a cost-effective and space-saving manner.

[0004] At least one of the above objects is achieved by a torsional vibration damper having the features according to claim 1. In addition, at least one of the above objects is achieved by a torsional vibration damper having the features according to claim 2.

[0005] Therefore, the damper output end can be inclined relative to the abutting element, and in this case, the influence on the damper characteristics is as small as possible or does not have an adverse effect on it. The number of components of the torsional vibration damper can be reduced.

[0006] The vehicle can be an automobile. For forward movement, the vehicle can have at least one drive element, preferably an internal combustion engine or an electric motor. The powertrain can be a hybrid powertrain, which has an internal combustion engine as a drive element and an electric motor as another drive element.

[0007] The torsional vibration damper can be implemented as a dual mass flywheel. The damper input end can have a main pendulum wheel and / or a cover plate.

[0008] The damper output end can have a torque limiter. The damper output member can be firmly connected to the torque limiter input end of the torque limiter, especially implemented in an integrally formed manner. The damper output member can be implemented as a Belleville spring flange.

[0009] The lubricant can be lubricating oil or grease.

[0010] The first and / or second contact surfaces can be implemented as convex spherical surfaces. The first and / or second contact surfaces can preferably be fully implemented as convex spherical surfaces, which means that they do not have a flat surface.

[0011] The abutting element can be a friction ring, in particular a flange ring. The abutting element can be made of plastic. The abutting element can be arranged radially inside the spring element. The abutting element can be arranged axially overlapping the spring element. In this way, the axial structural space of the torsional vibration damper can be reduced.

[0012] In a preferred embodiment of the invention, advantageously, the first abutting element has an elastomeric member, and the first contact surface is implemented on the elastomeric member. The elastomeric member can be an O-ring.

[0013] In a preferred embodiment of the invention, the first abutting element has a receiving element, and the elastomeric member is received in the receiving element. The receiving element can abut against the damper input end by means of another contact surface on a side axially opposite to the first contact surface.

[0014] In an advantageous embodiment of the invention, the connecting member is the damper output member. Thereby, the first abutting element can directly abut against the damper output member.

[0015] In a special design of the invention, advantageously, the first contact surface is the axial side surface of the abutting element and / or the second contact surface is the axial side surface of the connecting member. Thereby, the first abutting element can abut against the connecting member axially.

[0016] In a preferred embodiment of the invention, advantageously, the second abutting element is arranged axially opposite to the first abutting element with respect to the damper output member and has a third contact surface, and the third contact surface abuts against the fourth contact surface of the connecting member. Thereby, the connecting member can be arranged axially between the first and second abutting elements. The second abutting element can have another contact surface on a side axially opposite to the third contact surface of the second abutting element, and the another contact surface abuts against the damper input end or the spring member.

[0017] In a special design of the invention, advantageously, the fourth contact surface is the axial side surface of the connecting member axially opposite to the second contact surface. Thereby, the connecting member can be directly arranged axially between the first and second abutting elements. The third contact surface can be the axial side surface of the second abutting element.

[0018] In a preferred embodiment of the invention, advantageously, the first abutting element is implemented in a manner mirror-symmetrical with respect to the axial plane having the rotation axis as the normal. In this way, the first abutting element can be implemented in a cost-effective manner and the torsional vibration damper can be assembled with less error.

[0019] In a special embodiment of the present invention, advantageously, the first abutting element has another contact surface on a side of the first abutting element that is axially opposite to the first contact surface, and the other contact surface abuts against the input end of the shock absorber. In this way, the number of components of the torsional vibration damper can be reduced. The internal space of the shock absorber can be defined in a cost-effective manner. The device elements can be arranged axially directly between the output member of the shock absorber and the input end of the shock absorber.

[0020] In an advantageous embodiment of the present invention, the first abutting element is tensioned relative to the connecting member by at least one spring member. As an alternative or additional solution, the second abutting element can be tensioned relative to the connecting member by at least one spring member. The spring member can be a disc spring. The spring member can be arranged axially between the first abutting element and the input end of the shock absorber. The spring member can tension the contacting surfaces in contact relative to each other.

[0021] Other advantages and advantageous design solutions of the present invention result from the description of the drawings and the drawings. Description of the Drawings

[0022] The present invention will be described in detail below with reference to the drawings. Specifically shown:

[0023] Figure 1 : A half-sectional view of a torsional vibration damper in a special embodiment of the present invention.

[0024] Figure 2 : Figure 1 An enlarged partial view of the shown torsional vibration damper.

[0025] Figure 3 : A partial cross-section of a torsional vibration damper in another special embodiment of the present invention.

[0026] Figure 4 : A partial cross-section of a torsional vibration damper in another special embodiment of the present invention.

[0027] Figure 1 This is a half-sectional view of a torsional vibration damper 10 in a special embodiment of the present invention. The torsional vibration damper 10 is implemented as a dual-mass flywheel 12 and includes a shock absorber input end 16 that can rotate about a rotation axis 14. The shock absorber input end 16 includes a main flywheel 18 and a cover plate 20 connected thereto. The shock absorber input end 16 is detachably connected to a drive element (such as an internal combustion engine).

[0028] The torsional vibration damper 10 further includes a damper output end 22, which can be torsionally displaced relative to the damper input end 16 against the spring force of at least one spring element 24. The spring element 24 includes at least one helical spring 26, which preferably has an outer spring and an inner spring. The spring element 24 is, for example, an arc spring 28.

[0029] The damper output end 22 has a damper output member 30, which is coupled to the spring element 24 in a force-transmitting manner. The damper output end 22 includes a torque limiter 32, which has a torque limiter input end 34 implemented in an integrally formed manner with the damper output member 30. Friction linings 36 are axially fixed on both sides to the torque limiter input end 34, and these friction linings can be connected to the torque limiter output end 38 in a friction-locking manner to achieve torque transmission limited to a maximum torque.

[0030] The torque limiter output end 38 includes a side plate 40 that can be connected to one friction lining 36 in a friction-locking manner and a support plate 42 that can be connected to the other friction lining 36 in a friction-locking manner. The side plate 40 and the support plate 42 are radially fixed to each other inside the friction lining 36 by at least one fixing element 44 (here a riveting element 46). In addition, the driven element 48 (here a driven hub 50) is fixed to the torque limiter output end 38 by the fixing element 44. The driven hub 50 has an internal tooth portion 52, which is used for torque-transmitting connection to, for example, a transmission input shaft.

[0031] The spring element is accommodated in the damper internal space 54. The damper internal space 54 can be at least partially filled with a lubricant. The damper internal space 54 is bounded by the main flywheel 18 and the cover plate 20, and is also bounded by a first abutting element 56 and a second abutting element 58. The first and second abutting elements 56, 58 respectively abut against a connecting member 60 (here the damper output member 30).

[0032] Figure 2 For Figure 1 a magnified view of a part of the shown torsional vibration damper. The first abutting element 56 includes a first contact surface 62, which abuts against a second contact surface 64 of the damper output member 30 to seal the damper internal space 54. The first contact surface 62 is arranged on an axial side surface 66 of the first abutting element 56, and the second contact surface 64 is arranged on an axially adjacent axial side surface 68 of the damper output member 30.

[0033] The first contact surface 62 is at least partially implemented as a convex spherical shape. Therefore, the inclination of the damper output member 30 shown here does not affect the damping characteristics of the torsional vibration damper 10, especially because the friction between the first and second contact surfaces 62, 64 is uniform and controllable and decreases or does not become excessive as the damper output member 30 inclines.

[0034] The second abutting element 58 includes a third contact surface 70 which abuts against a fourth contact surface 72 of the shock absorber output member 30 to further seal the internal space 54 of the shock absorber. The third contact surface 70 is arranged on the axial side surface 74 of the second abutting element 58, and the fourth contact surface 72 is arranged on the axial side surface 76 which is axially adjacent to the shock absorber output member 30 and axially opposite to the second contact surface 64.

[0035] The spring member 78 (here a disc spring 80) tensions the second abutting element 58 relative to the shock absorber output member 30. Thereby, the spring force exerted by the spring member 78 acts on the third and fourth contact surfaces 70, 72, and also acts on the first and second contact surfaces 62, 64 through the axially restricted movable shock absorber output member 30.

[0036] The first abutting element 56 abuts against the shock absorber input end 16 (here the main flywheel 18) by means of another contact surface 82 which is implemented on the side of the first abutting element 56 that is axially opposite to the first contact surface 62. The second abutting element 58 abuts against the spring member 78 by means of another contact surface 84 which is implemented on the side of the second abutting element 58 that is axially opposite to the third contact surface 70.

[0037] The first abutting element 56 has a centering region 86 through which the first abutting element 56 is centered on the main flywheel 18. For this purpose, a shoulder 88 is implemented on the first abutting element 56, and it is received on a shoulder 90 which is also arranged on the main flywheel 18.

[0038] The second abutting element 58 has another centering region 92 through which the second abutting element 58 is centered on the cover plate 20. In this case, the centering region 86 abuts against the inner circumference 94 of the cover plate 20.

[0039] Figure 3 A partial cross-section of the torsional vibration damper in another specific embodiment of the present invention is shown. Except for the differences given below, the torsional vibration damper 10 is constructed in the same way as Figure 1 The first abutting element 56 is implemented in a mirror-symmetrical manner with respect to the axial plane 96 having the rotation axis as the normal. This means that the other contact surface 82 is also implemented as a convex spherical shape.

[0040] The first abutting element 56 radially abuts against the shoulder 90 of the main flywheel 18.

[0041] Figure 4 A partial cross-section of the torsional vibration damper in another specific embodiment of the present invention is shown. Except for the differences given below, the torsional vibration damper 10 is constructed in the same way as Figure 1Constructed in the same way. The first abutting element 56 has an elastomeric member 98, and the first contact surface 62 is implemented on this elastomeric member. The second abutting element 58 has another elastomeric member 100, and the third contact surface 70 is implemented on this other elastomeric member.

[0042] The first abutting element 56 has a receiving element 102, and the elastomeric member 98 is received in this receiving element. The second abutting element 58 has another receiving element 104, and the other elastomeric member 100 is received in this other receiving element.

[0043] The receiving element 102 abuts against the vibration damper input end 16 on the side of the first abutting element 56 that is axially opposite to the first contact surface 62 by means of another contact surface 82. The other receiving element 104 abuts against the spring member 78 on the side of the second receiving element 58 that is axially opposite to the third contact surface 70 by means of another contact surface 84.

[0044] Description of Reference Numerals

[0045] 10 Torsional Vibration Damper

[0046] 12 Dual-Mass Flywheel

[0047] 14 Rotating Shaft

[0048] 16 Vibration Damper Input End

[0049] 18 Main Flywheel

[0050] 20 Cover Plate

[0051] 22 Vibration Damper Output End

[0052] 24 Spring Element

[0053] 26 Helical Spring

[0054] 28 Arc Spring

[0055] 30 Vibration Damper Output Member

[0056] 32 Torque Limiter

[0057] 34 Torque Limiter Input End

[0058] 36 Friction Lining

[0059] 38 Torque Limiter Output End

[0060] 40 Side Plate

[0061] 42 Support Plate

[0062] 44 Fixing Element

[0063] 46 Riveting Element

[0064] 48 Driven element

[0065] 50 Driven hub

[0066] 52 Internal tooth part

[0067] 54 Internal space of shock absorber

[0068] 56 First abutting element

[0069] 58 Second abutting element

[0070] 60 Connecting member

[0071] 62 First contact surface

[0072] 64 Second contact surface

[0073] 66 Axial side surface

[0074] 68 Axial side surface

[0075] 70 Third contact surface

[0076] 72 Fourth contact surface

[0077] 74 Axial side surface

[0078] 76 Axial side surface

[0079] 78 Spring member

[0080] 80 Disc spring

[0081] 82 Another contact surface

[0082] 84 Another contact surface

[0083] 86 Centering area

[0084] 88 Shoulder

[0085] 90 Shoulder

[0086] 92 Another centering area

[0087] 94 Inner circumference

[0088] 96 Axial plane

[0089] 98 Elastomeric member

[0090] 100 Another elastomeric member

[0091] 102 Receiving element

[0092] 104 Another receiving element

Claims

1. A torsional vibration damper (10) for a vehicle powertrain, having: a damper input end (16) rotatable about a rotational axis (14), a damper output end (22) which can be torsionally displaced relative to the damper input end (16) against the spring force of at least one spring element (24), the damper output end having a damper output member (30), a damper interior space (54) which houses the spring element (24) and can be at least partially filled with a lubricant, a first abutment element (56) which delimits the damper interior space (54), the first abutment element having a first contact surface (62) which abuts against a second contact surface (64) of a connecting member (60) for sealing the damper interior space (54), characterized in that at least one of the contact surfaces (62, 64) is at least partially embodied as a convex spherical shape.

2. The torsional vibration damper (10) according to the preamble of claim 1 or according to claim 1, characterized in that the first abutment element (56) has an elastomeric member (98), and the first contact surface (62) is embodied on the elastomeric member.

3. The torsional vibration damper (10) according to claim 2, characterized in that, The first abutment element (56) has a receiving element (102), and the elastomeric member (98) is received in the receiving element.

4. The torsional vibration damper (10) according to any one of the above claims, characterized in that, The connecting member (60) is the damper output member (30).

5. The torsional vibration damper (10) according to any one of the above claims, characterized in that, The first contact surface (62) is an axial side surface (66) of the abutment element and / or the second contact surface (64) is an axial side surface (68) of the connecting member (60).

6. The torsional vibration damper (10) according to any one of the above claims, characterized in that A second abutment element (58) is arranged axially opposite the first abutment element (56) relative to the damper output member (30) and has a third contact surface (70) which abuts against a fourth contact surface (72) of the connecting member (60).

7. The torsional vibration damper (10) according to claim 6, characterized in that, The fourth contact surface (72) is an axial side surface (76) of the connecting member (60) which is axially opposite the second contact surface (64).

8. The torsional vibration damper (10) according to any one of the above claims, characterized in that, The first abutment element (56) is embodied in a mirror-symmetrical manner relative to an axial plane (96) having the rotational axis (14) as a normal.

9. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that, The first abutment element (56) has another contact surface (82) on a side of the first abutment element (56) which is axially opposite the first contact surface (62), and the another contact surface abuts against the damper input end (16).

10. The torsional vibration damper (10) according to any one of the above claims, characterized in that, The first abutment element (56) is tensioned relative to the connecting member (60) by at least one spring member (78).

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